Now, I am at the BOOT stage. The system can be booted up. But I don't know how to connect the USB mouse and keyboard, to control the system through the HDMI monitor which connects to the Xilinx board's HDMI port. The board has no USB ports to connect to the mouse/keyboard. So I connect the mouse and keyboard to the PC which has UART connection with the board. But this way, the mouse and keyboard can only be used with the PC, not the board.